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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include "libioP.h"
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#include <string.h>
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/* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
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Read chars into buf (of size n), until delim is seen.
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Return number of chars read (at most n).
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Does not put a terminating '\0' in buf.
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If extract_delim < 0, leave delimiter unread.
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If extract_delim > 0, insert delim in output. */
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_IO_size_t
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DEFUN(_IO_getline, (fp, buf, n, delim, extract_delim),
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_IO_FILE *fp AND char* buf AND _IO_size_t n
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AND int delim AND int extract_delim)
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{
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register char *ptr = buf;
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do
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{
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_IO_ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr;
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char *t;
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if (len <= 0)
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if (__underflow(fp) == EOF)
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break;
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else
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len = fp->_IO_read_end - fp->_IO_read_ptr;
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if (len >= n)
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len = n;
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t = (char*)memchr((void*)fp->_IO_read_ptr, delim, len);
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if (t != NULL)
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{
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_IO_size_t old_len = ptr-buf;
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len = t - fp->_IO_read_ptr;
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if (extract_delim >= 0)
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{
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t++;
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if (extract_delim > 0)
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len++;
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}
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memcpy((void*)ptr, (void*)fp->_IO_read_ptr, len);
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fp->_IO_read_ptr = t;
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return old_len + len;
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}
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memcpy((void*)ptr, (void*)fp->_IO_read_ptr, len);
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fp->_IO_read_ptr += len;
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ptr += len;
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n -= len;
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} while (n != 0);
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return ptr - buf;
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}
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